<template>
  <div class="goodsinfo-container">
    <transition 
        @before-enter="beforeEnter"
        @enter="enter"
        @after-enter="afterEnter">
        <div class="ball" v-show="ballFlag" ref="ball"></div>
    </transition>
    <!-- 轮播图区域 -->
    <div class="mui-card">
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
        </div>
      </div>
    </div>
    <!-- 商品购买区域 -->
    <div class="mui-card">
      <div class="mui-card-header">{{ goodsinfo.title }}</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p class="price">
            市场价：
            <del>￥{{ goodsinfo.market_price }}</del>&nbsp;&nbsp;销售价：
            <span class="now_price">￥{{ goodsinfo.sell_price }}</span>
          </p>
          <p>
            购买数量：
            <numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
          </p>
          <p>
            <mt-button type="primary" size="small">立即购买</mt-button>
            <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
          </p>
        </div>
      </div>
    </div>

    <!-- 商品参数区域 -->
    <div class="mui-card">
				<div class="mui-card-header">商品参数</div>
				<div class="mui-card-content">
					<div class="mui-card-content-inner">
						<p>商品货号：{{ goodsinfo.goods_no }}</p>
            <p>库存情况：{{ goodsinfo.stock_quantity }}</p>
            <p>上架时间：{{ goodsinfo.add_time | dateFormat}}</p>
					</div>
				</div>
				<div class="mui-card-footer">
          <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
          <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
        </div>
			</div>
  </div>
</template>
<script>
//导入轮播图组件
import swiper from "../subcomponents/swiper.vue";
//导入数字按钮
import numbox from "../subcomponents/goodsinfo_numbox.vue";

export default {
  data() {
    return {
      id: this.$route.params.id, // 将路由参数对象中的 id 挂载到 data , 方便后期调用
      lunbotu: [], // 轮播图的数据
      goodsinfo: {}, // 获取到的商品的信息
      ballFlag: false, // 控制小球的隐藏和显示的标识
      selectedCount: 1 // 保存用户选中的商品数量， 默认，认为用户买1个

    };
  },
  created() {
    this.getLunbotu();
    this.getGoodsInfo();
  },
  methods: {
    //获取轮播数据
    getLunbotu() {
      this.$http.get("api/getthumimages/" + this.id).then(result => {
        if (result.body.status === 0) {
          // 先循环轮播图数组的每一项，为 item 添加 img 属性，因为 轮播图 组件中，只认识 item.img， 不认识 item.src
          result.body.message.forEach(item => {
            item.img = item.src;
          });
          this.lunbotu = result.body.message;
        }
      });
    },
    //获取商品数据
    getGoodsInfo(){
      this.$http.get('api/goods/getinfo/' + this.id).then( result => {
        if(result.body.status === 0 ){
          this.goodsinfo = result.body.message[0]
        }
      })
    },
    goDesc(id) {
      // 点击使用编程式导航跳转到 图文介绍页面
      this.$router.push({ name: "goodsdesc", params: { id } });
    },
    goComment(id) {
      // 点击跳转到 评论页面
      this.$router.push({ name: "goodscomment", params: { id } });
    },
    getSelectedCount(count){
        this.selectedCount = count;
    },
    //点击加入购物车的处理逻辑爱
    addToShopCar(){
      //修改控制小球的隐藏和显示的标识
        this.ballFlag = !this.ballFlag;
        let goodsinfo = {
          id: this.id,
          count: this.selectedCount,
          price: this.goodsinfo.sell_price,
          selected: true
        }
       // 调用 store 中的 mutations 来将商品加入购物车
       this.$store.commit('addToCar',goodsinfo);
    },
    // 做动画的钩子函数
    beforeEnter(el){
      el.style.transform = "translate(0, 0)";
    },
    enter(el, done){
      el.offsetWidth;
      //获取小球在页面中的位置
      const ballPosition = this.$refs.ball.getBoundingClientRect();
      //获取小球动画结束的位置 在页面中的位置
      const badgePosition = document.getElementById('badge').getBoundingClientRect();

      //计算需要做动画的像素
      const xDist = badgePosition.left - ballPosition.left;
      const yDist = badgePosition.top - ballPosition.top;
      el.style.transform = `translate(${xDist}px, ${yDist}px)`;
      el.style.transition = "all 0.5s cubic-bezier(.4,-0.3,1,.68)";

      done()
    },
    afterEnter(el){
      this.ballFlag = !this.ballFlag;
    }
  },
  components: {
    swiper,
    numbox
  }
};
</script>
<style lang="scss">
.goodsinfo-container {
  background-color: #eee;
  overflow: hidden;

  .now_price {
    color: red;
    font-size: 16px;
    font-weight: bold;
  }

  .mui-card-footer {
    display: block;
    button {
      margin: 15px 0;
    }
  }

  .ball {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: red;
    position: absolute;
    z-index: 99;
    top: 400px;
    left: 150px;
  }
}
</style>